Thunder Eggs Type of Rock:
CONCRETIONRocksForKids.com

Thunder Egg - whole and cut in half
Jefferson County, Oregon USA

Thunder Egg - whole and cut in half

Brushy Canyon, Chiricahuas Mts.,
Cochise County, Arizona USA

Gaspe Peninsula Thundereggs / Geodes

In Mont Lyall, Quebec, thundereggs can be collected at a fee collecting
site. The thundereggs are found in rhyolite and are beige in colour on
the outside. Many have raised veins (like the stitching on a baseball).
Some are completed filled with agate in colours of beige, yellow and
orange. Others look more like geodes in that the centres are hollow and
quartz crystals with distinct terminations point inwards.

We provide equipment and training. Bring good shoes and your food.
Picnic area on site and two diamond saws for cutting your rock. You can
also visit a small museum presenting minerals and gems and a gift shop.
One of the best family activity! Average length of activity : 2 to 3
hours.